]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
ALSA: usb-audio: work around Android accessory firmware bug
authorClemens Ladisch <clemens@ladisch.de>
Sat, 15 Jun 2013 09:21:09 +0000 (11:21 +0200)
committerTakashi Iwai <tiwai@suse.de>
Mon, 17 Jun 2013 07:56:52 +0000 (09:56 +0200)
commit342cda29343a6272c630f94ed56810a76740251b
treef8cf67d4967a15d35089bf750f0ff82a90ed1725
parentd81bf8cf549f7a6656a64924672a42c101d17026
ALSA: usb-audio: work around Android accessory firmware bug

When the Android firmware enables the audio interfaces in accessory
mode, it always declares in the control interface's baInterfaceNr array
that interfaces 0 and 1 belong to the audio function.  However, the
accessory interface itself, if also enabled, already is at index 0 and
shifts the actual audio interface numbers to 1 and 2, which prevents the
PCM streaming interface from being seen by the host driver.

To get the PCM interface interface to work, detect when the descriptors
point to the (for this driver useless) accessory interface, and redirect
to the correct one.

Reported-by: Jeremy Rosen <jeremy.rosen@openwide.fr>
Tested-by: Jeremy Rosen <jeremy.rosen@openwide.fr>
Cc: <stable@vger.kernel.org>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
sound/usb/card.c